With every invoice run in the system it will raise an invoice batch.
You can Download Zip which will present you with mutlitple files.
Batch_x pdf will show you a PDF of all the invoices in that invoice run
Batch_x_sage will be a sage compatible export file of the invoice run
Batch_x_summary will be a csv file showing each invoice number along with the account name, account number, net, vat and total amounts
Post_X will be a PDF of invoices in the batch which do not contain a billing email address and therefore the system assumes you need to print and post.
Email from the invoice batch screen, will allow you to bulk send all invoices on that batch to the billing email address' set on the account.
If you have already emailed out that batch the email button will show you a log of the date, time invoice number and who it was sent to.